Rane MA 6S Multi-Channel Amp Schematics 电路图.pdf

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1、CAUTION: THESE SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED SERVICE PERSONNEL ONLY. TO AVOID ELECTRIC SHOCK DO NOT OPEN THE CHASSIS UNLESS YOU ARE QUALIFIED TO DO SO. REFER ALL SERVICING TO QUALIFIED RANE WARRANTY SERVICE STATIONS. Disassembly Procedure CAUTION: WAIT ABOUT 15 MINUTES AFTER THE AM

2、PLIFIER HAS BEEN POWERED DOWN BEFORE BEGINNING DISASSEMBLY, TO ALLOW THE POWER SUPPLY CAPACITORS TO DISCHARGE. 1. Remove the bottom cover: 4 each #6 x 3/8 phillips screws on the bottom of the side rails and 12 each #6 x 1/4 phillips screws on the bottom cover. 2. 80 Hz High Pass Internal Jumpers: To

3、 access the jumper on each amplifier card, locate J2 (LOW FILTER). The MA 6S is shipped with these jumpers in the OUT position (filters defeated). Moving this jumper to the IN position activates the filter. In the event that 80 Hz is not a high enough cutoff frequency, a table of resistor values is

4、provided below that replace R9, R10, and R11 on each amplifier card. d. To remove a module, first de-solder the wires running to the adjacent card. Be sure to note the location of all wires for later reassembly (A to A, B to B). Then remove 7 ea. of the #4-40 machine screws holding the output, drive

5、r and bias transistors to the heatsink. Now pull firmly straight up to disengage the module from the connector use a rocking motion to ease removal, as the connector is very tight. NOTE: Be sure that all of the transistor sil pads (insulators) stay on the heatsinksome of these may stick on the trans

6、istor and be inadvertently lost or thrown away with the defective component. New pads should be used whenever possible. 4. Module replacement: Factory supplied amplifier modules are pre-tuned and ready for installation. If you have made repairs on a module, be sure that ALL diodes are measured and r

7、eplaced as necessary prior to installation. a. Be sure that all heatsink sil pads (insulators) are in place. b. Be sure the nylon shoulder washers are in place on transistors Q2, Q4 and Q8 (TO-220 cases). Install the #4-40 screws in these and snug up only: Do not over- tighten these driver screws as

8、 this may damage the thin shoulder washers and cause a short. c. Install the remaining 4 ea. #4-40 screws on the output and tighten these firmly to ensure proper heat transfer to the heatsink. d. Resolder the black & white wires. Be careful to connect them properly. e. Slide the heatsink assembly fo

9、rward so that all LEDs are properly aligned in the front panel holes. Install and tighten the 8 heatsink mounting screws. f. Replace the 7 screws on the front panel. g. Replace the input/output plate and bottom cover (dont forget the 4 screws holding the bottom to the side rails). 5. Power supply re

10、pairs. a. Power supply PCB: Do not attempt removal of this card. Instead, remove amplifier modules #1 and #2 as neces- sary to allow clear access to the foil side of the power supply PCB, then replace any defective components by de-soldering. b. Transformer removal: The transformer is held in place

11、by one bolt securing the transformer to the flat mounting plate. Pull all transformer spade plugs from the power PCB and lift the transformer out of the chassis. To replace the transformer, reverse the above procedure. Reconnect all transformer spade plugs as shown on the power board designator diag

12、ram on the next page. MA 6S SERVICE INFORMATION FrequencyR9R10R11 80 Hz14.3k97.6k5.62k 100 Hz11.5k78.7k4.53k 125 Hz9.09k61.9k3.57k 160 Hz7.15k48.7k2.8k 200 Hz5.76k39.2k2.26k 250 Hz4.53k31.6k1.78k 315 Hz3.65k24.9k1.43k 3. To remove a module (PCB card): a. Remove the input/output plate on the rear pan

13、el by removing 7 phillips screws and 12 ea. #8 tapping screws from the Euroblocks. b. Remove the 7 phillips screws on the front panel just below the Level controls. c. Remove the 8 ea. #6/32x machine screws from the left and right edges of the heatsink mounting flange. Now the entire heatsink/module assembly is free to slide to the rearthis will provide the clearance necessary to remove any of the six amp modules. RadioFans.CN 收音机爱 好者资料库 MA 6S AMP CARD MA 6S BUS CONNECTOR MA 6S POWER SUPPLY RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库